A French professor says he believes the number of casualties on the front line in the First World War may have been severely underestimated. Professor Antoine Prost from the University of Paris believes at least another million may have been killed. VoR's Tim Ecott discussed his theory with Professor Edgar Jones, from King's College London and asked whether Professor Prost's findings struck a chord.

Professor Prost says the numbers of men suffering psychological symptoms is also probably low - partly due to the stigma attached to mental illness at the time.

Professor Jones told VoR: "Record keeping in the First World War was haphazard, given the very scale of the conflict. The Royal Army Medical corps was unprepared for the volume of physical and mental casualties. when it went to war in 1914."...